#include <REGX52.H>
#include <INTRINS.H>


void Delay1ms(unsigned int xms)		//@11.0592MHz
{
	unsigned char i, j;

	while(xms--)
	{
		_nop_();
		i = 2;
		j = 199;
		do
		{
			while (--j);
		} while (--i);
	}
}


int main()
{
	while(1)
	{
		if(P3_1==0)
		{
			Delay1ms(20);
			while(P3_1==0)
			{
			;}
			Delay1ms(20);
			
			P2_0 = ~P2_0;
		}
	}
}